AVS 59th Annual International Symposium and Exhibition
    Graphene and Related Materials Focus Topic Tuesday Sessions
       Session GR+AS+EM+MI+MN-TuM

Paper GR+AS+EM+MI+MN-TuM10
From Graphene to Amorphous Carbon by Sublimation and Condensation

Tuesday, October 30, 2012, 11:00 am, Room 13

Session: Optical, Magnetic, Mechanical and Thermal Properties
Presenter: B. Steele, University of South Florida
Authors: B. Steele, University of South Florida
R. Perriot, University of South Florida
V. Zhakhovsky, University of South Florida
I.I. Oleynik, University of South Florida
Correspondent: Click to Email
The mechanisms of the non-equilibrium melting process of graphene and the structure of the liquid phase of carbon was studied by molecular dynamics (MD). Graphene undergoes a non-equilibrium melting process at high temperature and low pressure as the carbon chains are formed out of the graphene sheet, thus making up a transient liquid phase of carbon. As the chains expand the material sublimates to a low dense gas of carbon chains. Under higher pressure the gas phase will condense to an intermediate porous phase of carbon with a significant sp2 fraction of atoms, followed by the liquid phase, and finally an amorphous phase. Mechanisms of melting of graphene, including formation of topological and Stone Wales (SW) defects in two and three dimensions will be discussed.